<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
        function App() {
            console.log("进入App");
            React.useEffect(()=>{
                console.log("useEffect调用了")
            })
            console.log("马上挂载");
            return <div><h1>App</h1></div>

        }
        ReactDOM.createRoot(document.getElementById("app")).render(<App />)
    </script>
</body>
</html>